A source said: "She'd had a few drinks. At first she thought she had broken something, so got her security to take her to hospital. The doctors were worried she might be concussed because she had a big bump on her head and a cut above her eye."

The 26-year-old star reportedly caused chaos at the private London clinic she was admitted to because of her drunken antics, with ward staff having to beg her to calm down.

Another onlooker told The Sun newspaper: "Amy was running up and down the corridors with her top off and smelling of alcohol. She has been heard complaining of pain caused by bruising on her breasts and around her ribs. The nurses had to step in and ask her to calm down. Eventually she had to be taken back to her room. The ward sister was absolutely fuming."

Amy's injuries have been described as "not serious" but she is refusing to leave hospital after being kept in overnight on Sunday.

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Her agent said: "She really likes the clinic so may stay a few days."

The star has already returned to the facility once this month as her implants were causing her pain.

Amy feared she would have to have them removed, but medics eventually gave her the all clear.